64-bit ruby 1.9.3-p448 on x86 in Solaris, compiled with the Studio 12.1 compiler,
core dumps against the test case for bug 4950 in bootstraptest/test_fork.rb.
This problem sounds similar to issue 6334, which was rejected due
to lack of information.
The core dump does not occur with 64-bit ruby 1.9.3 on sparc.